Publications
Publication Information
| Title | Instanton effects in twist-3 generalized parton distributions |
| Authors | Jun-Young Kim, Christian Weiss |
| JLAB number | JLAB-THY-23-3946 |
| LANL number | arXiv:2310.16890 |
| Other number | DOE/OR/23177-7244 |
| Document Type(s) | (Journal Article) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Journal Compiled for Physics Letters B Volume 848 Page(s) 138387 | |
| Publication Abstract: | The instanton vacuum picture is used to study hadronic matrix elements of the twist-3 (dimension-4, spin-1) QCD operators measuring the quark spin density and spin-orbit correlations. The QCD operators are converted to effective operators in the low-energy effective theory emerging after chiral symmetry breaking, in a systematic approach based on the diluteness of the instanton medium and the 1/Nc expansion. The instanton fields induce spin-flavor-dependent "potential" terms in the effective operators, complementing the "kinetic" terms from the quark field momenta. As a result, the effective operators obey the same equation-of-motion relations as the original QCD operators. The spin-orbit correlations are qualitatively different from naive quark model expectations. |
| Experiment Numbers: | other |
| Group: | THEORY CENTER |
| Document: | |
| DOI: | https://doi.org/10.1016/j.physletb.2023.138387 |
| Accepted Manuscript: | 2310.16890.pdf |
| Supporting Documents: | |
| Supporting Datasets: | |